* {
    margin: 0;
    padding: 0;
}
a {
    text-decoration: none;
}
li {
    list-style: none;
}
.banner {
    position: relative;
    width: 600px;
    height: 400px;
    margin: 0 auto;
    overflow: hidden;
}
.banner ul {
    position: absolute;
    left: 0;
    top: 0;
    width: 700%;
}
.banner ul li {
    float: left;
}
img  {
    width: 600px;
    height: 400px;
}
.left1 {
    display: none;
    box-sizing: border-box;
    position: absolute;
    left: 0;
    top: 50%;
    margin-top: -50px;
    width: 50px;
    height: 100px;
    background-color: pink;
    text-align: center;
    padding: 40px 0;
    z-index: 2;
}
.right1 {
    display: none;
    box-sizing: border-box;
    position: absolute;
    right: 0;
    top: 50%;
    margin-top: -50px;
    width: 50px;
    height: 100px;
    background-color: pink;
    text-align: center;
    padding: 40px 0;
    z-index: 2;
}
.circle {
    position: absolute;
    bottom: 40px;
    left: 41%;
}
.circle li {
    float: left;
    margin-right: 10px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 1px solid #fff;

}
.current {
    background-color: orangered;
}